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Finding the Fourth Proportional to 1,275.62, 1,761.01 and 991.40

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Solution

The fourth proportional to 1,275.62, 1,761.01 and 991.40 is: 1,368.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.62 : 1,761.01 = 991.40 : x
  2. Step 2: Convert to fraction form
    1,275.62/1,761.01 = 991.40/x
  3. Step 3: Cross multiply
    1,275.62x = 1,761.01 × 991.40
  4. Step 4: Simplify right side
    1,275.62x = 1,745,865.31
  5. Step 5: Solve for x
    x = 1,745,865.31/1,275.62
  6. Step 6: Final answer
    x = 1,368.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.